Self and william e



J. S. DETRICK.

Counting Register.

Patented Aug. 4,'1868.

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Witnesses: a me N. Firms, PNsTo-uwonwwnm wasmuemra u C.

@uiten tetes'v etrn @ffice JACOB S. DETRICK, AOF SAN FRANCISCO,CALIFORNIA, ASSIGNOR TO HIM- SELF AND WILLIAM R. ECKERT, OF' SAME PLACE.

IMPROVEMENT IN COUNTING-REGISTERS.

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TO ALL WHOM I'I MAY CONCERN:

Be itknown that I, JACOB S. DETRICK, of the city and county of SanFrancisco, and Stato of California, have invented a new and improvedPocket-Counter; and I do hereby declare that the following is a. full,clear, and exact description of the construction and operation of thesame, reference being had to the annexed drawings, making a part of thisspecification, inwhich- Figure 1 is a side view. v

Figure 2 is a section through the line a: x of iig. 3.

Figure' is a sectionthrough the line y y of iig. 1.

The object of this invention is to provide a neat and convenientpocket-instrument, by which the velocity of shafting, 81e., can beaccurately determined.- l

In the drawings, A is a circular plate, having a rim, B, and forming theback and edge of the instrument, 'and also coming 'down upon the face ofit, around its periphery, so as to form an annular rim, C.

D is the central portion of the face of the instrument. I Y Y A E is aspur-wheel, revolving on a spindle orjournal, F, at the centre of theinstrument, and provided with one hundred and one cogs, e e.'

I is another spur-wheel, ofthe same size as the wheel E, provided withone hundred eogs, zz, and revolving on the same shaft or spindle, infront of the wheel E. lIt is also provided with a projecting ring, M,which comes out even with the face of the instrument, between the rim Cand thc central portion, D, and is graduated .from 0 to 100.

The central part, I), of the face is connected with the wheel E oy beingattached to the shaft F, so as to l revolve with the shaft and the wheelE. The wheel I revolves loosely on the shaft, or on a collar or IlangeAof the wheel E surrounding the shaft. Either of the wheels, E I, mayhave the one hundred cogs, the other having one hundred and one. Theonly difference that will result will be that the revolutions will becounted to thc right from a fixed point on the ring M, in one instance,and to the left n thciothcr.

In connection with these parts I employ a lever, G, pivotcd to the rirnB at bfand provided with a socket, m, to receive and hold theconnecting-spindle.

J is a detachable connecting-spindle, having a sharp-pointed head, j,or, in lieu of it, alat rubber or guttaperchel hcd, and having also aworm-screw, n, of such a pitch that one revolution of it will advancethe wheels' E and I each one cog. v

The outer end of the socket m is enlarged, to receive the screw n, andits lower side is out away, to allow the screw to gear with the c-ogs eand i. A. niche or opening iscut in the rim B, at that point into whichthe screw drops, and which prevents the connecting-spindle from escapingfrom its socket m when the lover G is in the position shown in fig. 1 or2. A

By depressing thc end, g, of the lever, the screw n will be thrown up,so that it will ungcar with the cogs of the two wheels, and can readilybc removed. By pressing upward with the thumb or {inger against the end,

g, the screw will be held firmly in gear wit-l1 the wheels.

' he operation of this instrument is as follows:

'.lhe end, g, is depressed, and the connecting-spindle placed in itssocket, and brought down into gear with the two wheels E and I, theyhaving previously been set so that the 100 on the ring M is at the arrowa, on the rim C, and atthe arrow a on the central part, D, of the face.The parts being held in this position by the thumb or finger,l theheadjis applied .to the centre of the shaft whose velocity is to beascertained, and held so firmly against it that the motion ofthe shaftwill be communicated to the connecting-spindle. One hundred revolutionsof the latter will then turn the wheels E and I through the spaceoccupied by one hundred eogs on each, giving one wheel a full revolutionand the other a whole revolution m'inus one cog. '.Ihe arrow a, on theplate D, will then be distant from 100 on the ring M just one degree,indicating one hundred revolutions of the shaft. Every subsequent onehundred revolutions of the shaft will lseparato the arrow from 100 onedegree farther, until it passes through the whole one hundred degrees,indicating ten thousand revolutions of the shaft. If itis desired thatthe arrow a shall move forward, or to the right, from 100 on the ring,the wheel E must have one hundred cogs, the other having one hundred andone. I

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is- The combination ofthe lever G,'or itsequivalent, with the detachable-spindle J and the wheels E I, when theparts are constructed and arranged so as to operate together,substantially in the manner and for the purposes indicated.

To the above specification of my invention I have signed my hand, this16th day of March, 1868.

l i JACOB S. DETRIOK.

Witnesses:

CHAs. A. PETTIT, JAMES H. GMDLEY.

